You will need at least 17 30-inch tiles to cover 104 square feet. Each tile covers 6.25 square feet so you divide 104 by 6.25 which gives you 16.64 tiles. Add more tiles to allow for extras in case of damage to tiles during installation.
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480
12 inches = 1 foot Thus the tiles would be 1 foot square. You therefore need 30 to cover a 30 square foot room.
150 tiles
30 tiles! But you'll need more than 30 tiles to cover wastage, breakage, etc.
5 lbs at 1/4 inch joint.